Screen.



s. 0'. EDMONDS.

.SCREEN.

APPLICATION FILED MIG-I, I9I5.

1,212,151. Patented Jan. 9,1917.

iiililililil "urn STAT SAMUEL OWEN EDMONDS, OF NEW YORK, N. Y., ASSIGNOR TO I-IENDRICK MANUFAC- TURING COMPANY, OF CARBONDALE, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

sonnmv.

Patented Jan. 9, 1917.

Application filed. August 7, 1915. Serial 'No.'44=,151. 7

To all whom it may concern:

Be it known that I, SAMUEL O. EDMONDS, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Screens, of which the following is a specification. I

The invention relates particularly to 10 screens adapted for the separation of paring surface as possible, both because this results in most eflicient utilization of the screening surface and also because the area of screening surface is thereby minimized. As against such early separation of the particles, is the fact that a very large percentage of slate particles and a substantial percentage of coal particles are of such fracture as to present to the screening surface a fiat side or sides of too great magnitude to pass through the screen, as a result of which they frequently travel a considerable distance over the screening'surface without passing therethrough. Such particles, if so treated as to present to'the screening surface not 40 the flat sides but the edge thereof, would readily pass through a screen perforation, thereby not only affecting its own early separation from the mass, but also making way for another particle or otherparticles to come into intimate contact with the screening surface. The object of the present invention is to improve upon screens heretofore employed, chiefly in the respects above pointed out, whereby a device is provided of higher eificiency in the separating operation and the screening area, for a given quantity of mat r al minimized In carrying out my invention, I provide a preferably integral sheet of sheet-metal of stepped formation, each step, as well as the shoulder between the same and the next adjacent ste being provided with a lateral series 0 longitudinally-extending slots. either of the same width or of gradually increasing width in the direction of flow of the material. The slots of one step are arranged in staggered relation'to the slots of the adjacent step or steps, so that, for example, the webs between the slots of the first and third steps shall be opposite the slots of the second and fourth steps. These webs may, if desired, remain in the original level of the plate or-may be canted slightly, either all in the same direction or each two adjacent webs in opposite directions, so as to present slightly inclined surfaces on either side of alternate slots in each series. Preferably, at a point approximately midway the slotted area, and extending, generally speaking, at right angles to the longitude of the slots, I provide the webs (or certain of them) bounding the slots with elevations or protuberancesdesigned to contact with the material passing over the screening surface, to preventthe same from sliding with a side or face of the particles'in contact with the screen but of such magnitude as not to pass through the openings thereof. These elevations or protuberances may conveniently be formed coincidently with the bending of theplate, to give it the stepped formation above referred to. Material falling upon the screen surface is, in my invention, practically continuously agitated, turned and its coactionwith the slots of the screening surface facilitated, both by means of the elevations or protuberances and also by means of the shoulders bounding the several steps-in the plate. As a result, the separation of particles of asize suitable to permit themto pass through the slots in the screening surface is facilitated and the ready and more accurate separation of the particles of the mass assured.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of a screen provided with my inventiom Fig. 2 is a longitudinalsection on the line 2-2 of Fig. 1, and Figs. 3, a and 5 are enlarged fragof a suitable punch-press, transverse series of slots, 2, are formed, leaving on all sides margins 73, which are imperforate save for such bolt-holes (not shown) as may be required to secure the plate to a suitable frame. In the drawings, the slots 2 are shown as of tapering form, 2'. 6., smaller at the ends nearest to. thehighest portionof the plate; they may however, if desired, be of the same width throughout. I

After the sheet has been slotted as, above described, it is formed, preferably by means of asuitable press,"into a series of steps (see Fig. 2), each step being characterized by a shoulder 4, and each successive step, toward the right, being depressed below the level of the next adjacent step toward the left, 'As clearly shown in the drawings, the

' shoulders 4 are formed in the slotted portions of the plate, the slots ofeach series preferably extending beyond the shoulder t of that series and a short distance into the "next adjacent step toward the right, the object being that particles of material turned or agitated at the pointof location of the step shall have an opportunity to pass through the slots immediately below the highest portion'of the shoulder, but if not,

then that such particles, falling slightly beyondthe ends of the slots on one step, shall fall upon the solid portion of the next, adjacent step, such portion supplying adequate V strength at a point where the screen is subtuberances 5 may characterizeonly the webs I jected to more than usual wear.

Either coincidently with giving the sheet the stepped formation or as a subsequent operation, the webs bounding the slots 2 may be slightly canted, in manner above described. Also, either coincidently with one or both such operations or by a subsequent operation, the web-bars bounding the slots of each-step, (or certainof such webbars or those of certain steps) are provided with integral elevations or protuberances 5, pro- ]ecting upwardly (see particularly Fig. 2)

from-the otherwise substantially level surface of the step. These elevations or probetween the slots or may extend entirely across the plate, therefore characterizing alsothe imperforate margins 3. v To serve tuberances, those having the effect'to agitate the purpose for which they are intended,

however, it is necessary only that they be.

formedin the webs, so thatthe mass of material fed upon the screening surface. may,

early in its passage over such surface, come into contact with such elevations or proand turn the particlesof coalor other mate rial to break up aggregations'of such particles,'and, in general, as above explained, to facilitate the passage of the particles through the slots of the screening surface and'as' early as-possible in the passage of the material over such surface.

While for economy and ease of operation I prefer to form the elevations or protuberances in the manner above described and as illustrated in Figs. 1 and 2, it is not essential that the same take the particular form so illustrated and described, as I may, if

desired, form the elevations or protuberances diagonally of the webs, as shown at 5, all the elevations running in the same direction or alternately in different-directions, as shown; at 5 Fig. 4. Or the elevations orprotuberances maybe arranged in two lines, each at an angle to the other, as illustrated in Fig. 5, and theselines may extend over the whole of the plate, as illus trated in full lines in said figure, or may be combined with marginal ridges 5 having the effect to prevent too great accumulation OfPElltlClQS along the imperforate margins of the plate where the same may not be covered by the frame (not shown) to which the plate may be attached.

Under certain conditions, dependent, among other things, uponthe character of the material being treated, and the incline (if any) of the screen, the extensions or protuberances may be omitted from certain of the webs or even from certain of the steps. To such extent as may be necessary to accomplish the purpose stated they should be provided, however, in one or another of the several forms herein indicated.

By means of the: invention above described, a highly efiicient screening device is provided, adapted for a variety of uses, as, for instance, in connection vwith loading chutes, or. under revolving screens, or for the separation of slate from coal, and as aforesaid the screen may be used either stationary, the mass being fed continuously over its surface, or may be mounted to oscillate 1. An integral screen of sheet-metal, provided at intervals with transverse shoulders determining areas or steps lying in different planes,each such area or step being provided with a seriesof substantially parallel slots, the slots of all the series extending in the same direction, and integral elevations or protuberances formed in the working surface of the screen, in the path of material treated thereon, substantially as set forth.

2. An integral screen of sheet-metal, provided at intervals with transverse shoulders determining areas or steps lying in different planes, each such area or step being provided with a series of substantially parallel slots, and integral elevations or protuberances formed in certain of the webs bounding said slots, at points intermediate of the ends of said slots, substantially as set forth.

3. An integral screen of sheet-metal, provided at intervals with transverse shoulders determining areas or steps lying in diiferent planes, each such area or step being provided with a series of substantially parallel slots whose ends extend over a shoulder adjacent to said step or area the slots of all the series extending in the same direction and into the next adjacent step or area, and lntegral elevations or protuberances formed in the working surface of the screen, in the path of material treated thereon, substantially as set forth.

4. An integral screen of sheet-metal, pro vided at intervals with transverse shoulders determining areas or steps lying in different planes, each such area or step being provided with a series of substantially parallel slots whose ends extend over a shoulder adjacent'to said step or area and into the next adjacent step or area, and integral elevations or protuberances formed in certain of Webs bounding said slots, at points intermediate of the ends of said slots, substantially as set forth.

This specification signed and witnessed this 2nd day of August, 1915.

SAMUEL OWEN EDMONDS.

Witnesses:

M. S. GANG, I. MoIN'rosH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

